Fixes and updates

- Add CSP policy to fix youtube embeds
- Remove twitter timeline
- Add nightly build link to download page

Change-Id:If17ec8dbd1de435c9a0caedf4daa7ae6ebe3c5b2
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/incubator-asterixdb-site/+/19070
Reviewed-by: Ian Maxon <imaxon@apache.org>
diff --git a/content/download.html b/content/download.html
index 1b8233a..d66ee01 100644
--- a/content/download.html
+++ b/content/download.html
@@ -8,6 +8,7 @@
     <meta name="description" content="">
     <meta name="author" content="">
     <link rel="icon" href="favicon.ico">
+    <meta http-equiv="Content-Security-Policy" content="frame-src youtube.com www.youtube.com">
 
     <title>Download</title>
 
@@ -172,6 +173,29 @@
     <p><a class="btn btn-md btn-success" href="http://www.apache.org/dyn/closer.lua/asterixdb/asterixdb-jdbc-0.9.8.3/asterixdb_jdbc.taco" role="button">Download AsterixDB Tableau Connector 0.9.9 <i class="fa fa-download fa-lg"></i> </a></p>
   </div>
 
+
+</div>
+
+<div class="row">
+
+<div class="col-md-6">
+    <h3 id="nightly-build">Nightly Build</h3>
+
+  </div>
+</div>
+
+<div class="row">
+
+<div class="col-md-6">
+    <p>This is a nightly build of the latest work in AsterixDB. This is intended for developers looking to work with the bleeding edge. Don’t use this in production! Expect things to break. It is not vetted through the Apache release process, and is not an official release.</p>
+  </div>
+
+<div class="col-md-6">
+
+    <p><a class="btn btn-md btn-warning" href="https://ci-builds.apache.org/job/AsterixDB/job/asterixdb-snapshot-integration/lastSuccessfulBuild/artifact/asterixdb/asterix-server/target/asterix-server-0.9.10-SNAPSHOT-binary-assembly.zip" role="button">Download AsterixDB Dev Build <i class="fa fa-download fa-lg"></i> </a></p>
+
+  </div>
+
 </div>
 
 </div>